JP3827184B2 - Dome-shaped electrode tip shaping method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tip dresser for cutting and shaping a dome-shaped electrode tip used mainly in a resistance welding machine, and more particularly to the shape of a cutter holder and a cutter blade.
[0002]
[Prior art]
In general, various means have been disclosed for cutting and shaping an electrode tip of a resistance welder. As an apparatus for cutting and shaping, there is a chip dresser that rotates a cutting tool via a gear, a belt, or a chain by a motor using compressed air, hydraulic pressure, or electricity as a driving source, and cuts and shapes an electrode tip by the cutting tool. The cutting tool is a one-blade type in which both the side and end face cutting blades are integrally formed to cut both the side and end faces of the tip of the electrode tip, or a two-blade type in which the side and end face cutting blades are separated. Is used. The electrode tip also includes a dome shape having a conical shape at the tip and a hemispherical shape at the side.
[0003]
FIG. 5 shows a cross-sectional view of a tip dresser using a conventional tip dresser and cutter. A gear 59 connected to a drive source (not shown) is inserted into the housing 58 so as to be rotatable, and a cutter holder 51 having a gear 56 meshing with the gear 59 is inserted into the housing 58. ing. The cutter holder 51 is formed with openings 54 and 54 on both upper and lower surfaces, and the openings 54 and 54 have perforations (not shown) for discharging chips. A cutter 52 having cutting edges 53 and 53 is screwed into the cutter holder 51 with a fastening bolt 57 in the perforation. The shapes of the opening portions 54 and 54 of the cutter holder 51 and the cutting blades 53 and 53 of the cutter 52 are curved portions 54b and 54b and curved portions for cutting and shaping the spherical surface portions 50b and 50b of the dome-shaped electrode tips 50 and 50, respectively. 53b, 53b, and linear portions 54c, 54c and linear portions 53c, 53c for cutting and shaping the tapered portions 50c, 50c connected to the spherical portions 50b, 50b. The cutting blades 53, 53 are formed so as to slightly protrude from the cross section 51 a of the cutter holder 51 in order to cut the dome-shaped electrode tips 50, 50.
[0004]
[Problems to be solved by the invention]
However, since the dome-shaped electrode tips 50 and 50 have electrode tips having a plurality of diameters, the spherical portions 50b and 50b and the tapered portions 50c and 50c have different shapes. In order to perform cutting and shaping into a corresponding shape, the cutting blades 53 and 53 of the cutter holder 51 and the cutter 52 are also required to have shapes corresponding to the shapes of the respective dome-shaped electrode tips 50 and 50. For example, FIG. 6A shows a dome-shaped electrode tip 60 having a diameter of 16 mm, and FIG. 6B shows cutter holders 61 and 71 and cutters 62 and 72 for cutting and shaping a dome-shaped electrode tip 70 having a diameter of 13 mm. The cutting blades 63 and 63 of the cutter 62 are used to cut and shape the dome-shaped electrode tip 60 having a diameter of 16 mm, linear bottom portions 63a and 63a, curved portions 63b and 63b having a curvature radius of 8 mm, and linear portions 63c and 63c connected thereto. In addition, the cutting edges 73 and 73 of the cutter 72 are used to cut and shape the dome-shaped electrode tip 70 having a diameter of 13 mm, and the straight bottom portions 73a and 73a and the curved portions 73b and 73b having a curvature radius of 6.5 mm. In addition, linear portions 73c and 73c connected thereto are formed. Accordingly, the opening portions 64 and 74 of the cutter holders 61 and 71 also require the same shape as described above. Thus, the cutter holder and the cutter blade formed in a shape corresponding to the diameter of each dome-shaped electrode tip are required, and the versatility is poor. In addition, since a curved portion having an arc shape must be formed between the bottom portion and the straight portion having a linear shape, a high degree of workability is required because the shape connected between the respective portions is not smooth.
[0005]
Therefore, in the present invention in view of the above circumstances, to allow cutting shaping the dome electrode tip diameter 16mm and diameter 13mm in a single chip dresser, and a dome-shaped electrode tip to be simplified shape of the cutting edge of the cutter holder and cutter It aims at providing the shaping method of.
[0006]
[Means for Solving the Problems]
The present invention has been made in order to achieve the above object, and on both the upper and lower surfaces, a mortar-shaped aperture portion comprising a bottom portion and a linear portion inclined from the bottom portion is formed, and the upper and lower aperture portions are formed. A cutter holder provided with a perforation between them, and mounted in the perforation so as to slightly protrude from the cross section of the cutter holder toward the aperture, and is located on both upper and lower sides in parallel with the bottom of the aperture A cutting blade having a cutting blade bottom portion, a cutting blade straight portion positioned in parallel with the straight portion of the opening portion, and a cutting blade curve portion interposed between the cutting blade bottom portion and the cutting blade straight portion is formed. A radius of curvature of the cutting edge curve portion is 8 mm, which is the same diameter as the radius of the dome-shaped electrode tip having a diameter of 16 mm, and the curvature of the end of the cutting edge curve portion and the curvature of the cutting edge curve portion. A line connecting the center point of the radius and a diameter of 16 The crossing angle formed by the axis of the dome-shaped electrode tip with a diameter of m or the dome-shaped electrode tip with a diameter of 13 mm is from 35 °, and the horizontal width of the tapered portion of the dome-shaped electrode tip with a diameter of 13 mm is 0.84 mm. Is set to a range of up to 45 °, and the cutting edge linear portion is extended tangentially from the end of the cutting edge curve portion to each dome-shaped electrode tip having a diameter of 16 mm and a diameter of 13 mm. The dome-shaped electrode tip shaping method is characterized in that it is shared and shaped .
[0009]
By setting it as the above structures, the electrode tip of diameter 16mm and diameter 13mm can be cut and shaped by the chip dresser provided with one cutter holder and a cutter. Further, the cutter holder and the cutter blade can be formed in a simple shape.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a cutter holder of a chip dresser and a cutter blade according to the present invention will be described with reference to the drawings. 1 is a plan view of the cutter holder and the cutter, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is a diagram showing the shape of the cutter blade, and FIG. It is the figure applied to different dome-shaped electrode tips. In the present embodiment, a cutter holder and a cutter blade that can be shared by a dome-shaped electrode tip having a diameter of 16 mm and a dome-shaped electrode tip having a diameter of 13 mm will be described.
[0011]
First, the whole structure of the cutter holder and cutter which concerns on this invention is demonstrated based on FIG.1 and FIG.2. The cutter holder 1 has a substantially disk shape, has a gear 6 on the outer periphery, and forms mortar-shaped opening portions 4 and 4 on both upper and lower surfaces. A perforation 5 is provided between the upper and lower openings 4 and 4 for discharging chips during cutting and attaching the cutter 2. The cutter 2 is inserted into the perforation 5, the back surface of the cutter 2 is abutted against the cutter holder 1, positioned, and screwed with the tightening bolt 7. The cutter 2 is a flat plate and has a substantially Y shape. The cutting blades 3 and 3 have bottom portions 3a and 3a, curved portions 3c and 3c, and straight portions 3e and 3e in order to cut and shape the dome-shaped electrode tips 10 and 10, and slightly protrude from the cross section 1a of the cutter holder 1. Form. Further, the opening 4 is formed with straight portions 4b and 4b parallel to the straight portions 3e and 3e of the cutting blades 3 and 3, and bottom portions 4a and 4a parallel to the bottom portions 3a and 3a of the cutting blades 3 and 3.
[0012]
Next, the shape of the cutting edge 3 of the cutter 2 that can be shared by the dome-shaped electrode tip 13 having a diameter of 13 mm and the dome-shaped electrode tip 16 having a diameter of 16 mm will be described with reference to FIG. The bottom 3a of the cutting blade 3 has a linear shape in order to shape the tip flat portions 13a and 16a of the dome-shaped electrode tips 13 and 16 flatly. The curved portion start end 3b of the cutting blade 3 is determined by the areas of the tip flat portions 13a and 16a of the dome-shaped electrode tips 13 and 16. Since the areas of the tip flat portions 13a and 16a are determined by the thickness and composition of the workpiece to be welded, the curved portion start end 3b changes accordingly.
[0013]
The curved portion 3c of the cutting edge 3 is formed with a radius of curvature of 8 mm having the same diameter as the radius of the dome-shaped electrode tip 16 having a large diameter of 16 mm. This is because the curved portion 3c is formed with the radius of the large-diameter dome-shaped electrode tip 16 so that it can be shared with the small-diameter dome-shaped electrode tip 13. The curved portion 3c shapes the spherical portions 13b and 16b when the dome-shaped electrode tips 13 and 16 are cut and shaped.
[0014]
The curved portion end 3d of the cutting edge 3 is determined at the intersection with the radius R having a predetermined angle from the axis C. The predetermined angle has a lower limit value and an upper limit value. The lower limit value of the angle from the axis C allowed for determining the curved end 3d of the cutting edge 3 is 35 °. If the angle from the axis C is less than 35 °, when the dome-shaped electrode tips 13 and 16 are cut and shaped, the centripetal force is weakened, so that the core runout occurs, and the dome-shaped electrode tips 13 and 16 are accurately It is because it becomes impossible to shape.
[0015]
The upper limit value of the angle from the axis C allowed for determining the curved end 3d of the cutting edge 3 is such that the taper width 13w of the dome-shaped electrode tip 13 having a small diameter of 13 mm is 0.84 mm or more. It is set as the angle which the cutting blade 3 can cut and shape so that it may have. That is, in order to ensure the taper width 13w of 0.84 mm or more, the upper limit value of the angle from the axis C is set to 45 °. The taper width 13w is the horizontal width of the taper portion 13c connected to the end of the spherical surface portion 13b of the dome-shaped electrode tip 13 having a diameter of 13 mm. Similarly to the above, when the taper width 13w is less than 0.84 mm, when the dome-shaped electrode tips 13 and 16 are cut and shaped, the centripetal force is weakened, so that the core runout occurs. This is because it cannot be shaped into an accurate shape. In addition, securing the taper width 13w of the small-diameter dome-shaped electrode tip 13 of 0.84 mm or more inevitably means that the taper width 16w of the large-diameter dome-shaped electrode tip 16 is 0.1 mm. 84 mm or more is secured.
[0016]
The straight portion 3e of the cutting edge 3 extends in a straight line shape from the curved portion end 3d in the tangential direction of the curved portion 3c. The straight portion 3e shapes the tapered portions 13c and 16c when the dome-shaped electrode tips 13 and 16 are cut and shaped.
[0017]
For example, when the angle from the axis C is 45 °, the end of the curved portion of the cutting edge 3 is at a position 3d2, and the straight portion 3e2 is formed in the tangential direction from the curved portion end 3d2 to the curved portion 3c. At this time, the taper width 13w2 of the dome-shaped electrode tip 13 having a diameter of 13 mm is 0.84 mm, and the taper width 16w2 of the dome-shaped electrode tip 16 having a diameter of 16 mm can be ensured to be 0.84 mm or more. When the angle from the axis C is set to 35 °, the end of the curved portion of the cutting edge 3 is located at 3d1, and the straight portion 3e1 is formed in the tangential direction from the curved portion end 3d1 to the curved portion 3c. At this time, the taper widths 13w1 and 16w1 can secure a sufficient width of 0.84 mm or more.
[0018]
FIG. 4 illustrates a case where the cutter holder 1 and the cutter 2 of the present invention are shared by a dome-shaped electrode tip 16 having a diameter of 16 mm and a dome-shaped electrode tip 13 having a diameter of 13 mm. First, the configuration of the cutter holder 1 and the cutter 2 will be described with reference to FIG. The curvature radii of the cutting blades 3 and 3 of the cutter 2 are determined to be 8 mm, the curved ends 3d and 3d are determined to have an angle from the axis C of 45 °, the bottoms 3a and 3a of the cutting blades 3 and 3 and the curved portions 3c and The 3c and the straight portions 3e and 3e are formed by the above method. Further, the bottom portions 4a and 4a of the opening portions 4 and 4 are formed in parallel with the bottom portions 3a and 3a of the cutting blades 3 and 3, and the straight portions 4b and 4b of the opening portions 4 and 4 are straight lines of the cutting blades 3 and 3, respectively. It forms in parallel with the parts 3e and 3e. The cutting blades 3, 3 are formed so as to protrude slightly forward with respect to the cross section 1 a of the cutter holder 1, and this protruding width is the cutting thickness of the cutting blades 3, 3.
[0019]
(A) When applied to a dome-shaped electrode tip 16 having a diameter of 16 mm as shown in the figure, the taper width 16w is secured to 2.34 mm, and sufficient centripetal force can be obtained at the time of cutting and shaping can be performed stably. Accordingly, the tip flat part 16a, the spherical part 16b and the tapered part 16c of the dome-shaped electrode chip 16 also have a smooth shaping surface.
[0020]
Further, when applied to a dome-shaped electrode tip 13 having a diameter of 13 mm as shown in FIG. 5B, the taper width 13w is secured to 0.84 mm, and stable shaping can be performed in the same manner as described above. Further, although the curvature radius of the curved portions 3c and 3c of the cutting blades 3 and 3 is 8 mm, since the taper width 13w is sufficiently secured, the shaping can be performed without any problem and the shaping surface is smooth.
[0021]
With the configuration of the cutter holder 1 and the cutting blade 3 of the cutter 2 as described above, the cutting and shaping of the two dome-shaped electrode chips 13 and 16 having different diameters are shared by one cutter holder 1 and one cutter 2. It becomes possible. Moreover, since the shape of the cutting blades 3 and 3 is such that the straight portions 3e and 3e connected to the curved portions 3c and 3c are tangential to the curved portions 3c and 3c, the shape connecting the curved portions 3c and 3c to the straight portions 3e and 3e is smooth. Furthermore, since the shape of the cutter holder 1 is simplified by making the straight portions 4b and 4b parallel to the straight portions 3e and 3e of the cutting blades 3 and 3, workability for forming the cutter holder 1 and the cutter 2 is also improved.
[0022]
Further, a case will be described in which the cutter holder 1 and the cutter 2 are exclusively used for cutting and shaping only the dome-shaped electrode tip 16 having a diameter of 16 mm or the dome-shaped electrode tip 13 having a diameter of 13 mm according to the configuration of the present invention. In the case of exclusive use for the dome-shaped electrode tip 16 having a diameter of 16 mm, the curved end portions 3d and 3d of the cutting blade 2 have an upper limit value of the angle from the axis C of 62 ° (the angle at which the taper width 16w is 0.84 mm), The lower limit is determined as 35 °, and the cutting blades 3 and 3 of the cutter 2 and the cutter holder 1 are formed. When the dome-shaped electrode tip 13 having a diameter of 13 mm is used exclusively, the upper ends of the curved portions 3d and 3d of the cutting blade 2 are 45 ° (the angle at which the taper width 13w is 0.84 mm) from the axis C. Thus, the lower limit value is determined as 35 °, and the cutting blades 3 and 3 and the cutter holder 1 of the cutter 2 are formed.
[0023]
The present invention is not limited to the above-described embodiment, and can be implemented in various forms .
[0024]
【The invention's effect】
In the present invention, the configuration of the cutter holder and the cutting edge of the cutter as described above enables cutting and shaping with one cutter holder and one cutter when cutting and shaping a dome-shaped electrode tip having a diameter of 16 mm and a diameter of 13 mm. Become. In addition, since the shapes of the cutter holder and the cutter blade are simplified, processability is improved and processing costs can be reduced.
[Brief description of the drawings]
FIG. 1 is a plan view of a cutter holder and a cutter according to the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a view showing a shape of a cutting edge of a cutter according to the present invention.
FIG. 4 is a diagram in which the cutter holder and the cutter blade according to the present invention are applied to dome-shaped electrode tips having different diameters.
(A) It is the figure applied to the dome-shaped electrode tip of diameter 16mm.
(B) It is the figure applied to the dome-shaped electrode tip of diameter 13mm.
FIG. 5 is a cross-sectional view showing a conventional chip dresser device.
FIG. 6 is a diagram in which a conventional cutter holder and cutter blade are applied to a dome-shaped electrode tip.
(A) It is the figure applied to the dome-shaped electrode tip of diameter 16mm.
(B) It is the figure applied to the dome-shaped electrode tip of diameter 13mm.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cutter holder 1a Cross section 2 Cutter 3 Cutting edge 3a Bottom part 3b Curved part start edge 3c Curved part 3d Curved part termination | terminus 3e Straight line part 4 Opening part 4a Bottom part 4b Straight line part 5 Perforation 6 Gear 7 Clamping bolt 10, 13, 16 Dome shape electrode Tip 13a, 16a Tip flat part 13b, 16b Spherical surface part 13c, 16c Taper part 13w, 16w Horizontal width C of taper part C Center R Radius

Claims (1)

A mortar-shaped aperture portion consisting of a bottom portion and a straight portion inclined from the bottom portion is formed on both upper and lower surfaces, and a cutter holder provided with a perforation between the upper and lower aperture portions, and the cutter holder Attached inside the perforation so as to slightly protrude from the cross section toward the aperture , and on both the upper and lower surfaces, a cutting blade bottom located parallel to the bottom of the aperture, and a straight portion of the aperture A cutter formed with a cutting blade having a cutting blade straight portion, and a cutting blade curve portion interposed between the cutting blade bottom portion and the cutting blade straight portion,
The radius of curvature of the cutting edge curve portion is 8 mm, which is the same diameter as the radius of the dome-shaped electrode tip having a diameter of 16 mm,
A crossing angle formed by a line segment connecting the end of the cutting edge curve portion and the center point of the radius of curvature of the cutting edge curve portion and the axis of the dome-shaped electrode tip having a diameter of 16 mm or the dome-shaped electrode tip having a diameter of 13 mm. , And a range from 35 ° to 45 ° where the horizontal width of the tapered portion of the dome-shaped electrode tip having a diameter of 13 mm is 0.84 mm,
The cutting edge linear portion is shaped in common with respect to each dome-shaped electrode tip having a diameter of 16 mm and a diameter of 13 mm by a tip dresser extending in a tangential direction from the end of the cutting edge curve portion. A method for shaping a dome-shaped electrode tip .

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